Convert SolidWorks file to step format incomplete

Hi Guys,

I have a SolidWorks assembly file and converted it to step format. When I open the step file in SolidWorks, only 1 part is opened.

The SolidWorks file has total 19 sub assemblies and parts combine.

I have already done a clean uninstall of SolidWorks 2015 and reinstall of SolidWorks but problem still exist. Also I disable KB 3072630 before reinstalling SolidWorks.

The problem does not happen on other assembly files.

Any advise?

James

SolidworksImport export